If your kids like the fairy books, head over to Amazon.com where right now and while these last you can snag 11 of the Fairy Books written by Andrew Lang completely free. The Gray Fairy is the only one not free, and that one is even marked down to $1.99. Not too bad.
These books have nice reviews, too. Be sure to check them out here.
You can get this book delivered to many devices other than a Kindle, like an iPad or another tablet or mobile device. See here for help.